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Laboratory investigation of stress gradient effect at spalling experiments on granite
RISE - Research Institutes of Sweden, Safety and Transport, Safety.ORCID iD: 0000-0003-4526-4061
RISE - Research Institutes of Sweden, Built Environment, CBI Swedish Cement and Concrete Research Institute.
2015 (English)In: The 13th International Congress of Rock Mechanics: ISRM Congress 2015, 2015Conference paper, Poster (with or without abstract) (Refereed)
Abstract [en]

A series of laboratory tests were conducted to study stress-induced spalling on medium to coarse-grained granite specimens. The specimens made from cylinders had two manufactured notches on opposite sides aimed to represent the tangential loading around a circular opening. Specimens of three different sizes were tested with notch radii, 98.5, 225 and 375 mm, representing 197, 450 and 750 mm diameter holes, to study the effect of notch radius on the spalling initiation stress. The cracking was monitored by acoustic emission sampling. The fracture patterns were investigated visually on polished slabs and by microscopy on thin sections. The crack analysis describes how the cracks propagate in relation to the grain structure in the rock and to the macroscopic stress field.

Place, publisher, year, edition, pages
2015.
Keywords [en]
Crystalline rock, Spalling, Laboratory experiments, Microscopy analysis, Fractures
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-33950ISBN: 978-1-926872-25-4 (electronic)OAI: oai:DiVA.org:ri-33950DiVA, id: diva2:1225354
Conference
ISRM 13th International Congress on Rock Mechanics, May 10-13, 2015, Montreal, Canada
Funder
Swedish Nuclear Fuel and Waste Management Company, SKBAvailable from: 2018-06-26 Created: 2018-06-26 Last updated: 2019-07-11Bibliographically approved

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Jacobsson, Lars

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